// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <sstream>
#include <unordered_set>

#include "base/strings/string16.h"

#include "base/strings/utf_string_conversions.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace base {

// We define a custom operator<< for string16 so we can use it with logging.
// This tests that conversion.
TEST(String16Test, OutputStream)
{
    // Basic stream test.
    {
        std::ostringstream stream;
        stream << "Empty '" << string16() << "' standard '"
               << string16(ASCIIToUTF16("Hello, world")) << "'";
        EXPECT_STREQ("Empty '' standard 'Hello, world'",
            stream.str().c_str());
    }

    // Interesting edge cases.
    {
        // These should each get converted to the invalid character: EF BF BD.
        string16 initial_surrogate;
        initial_surrogate.push_back(0xd800);
        string16 final_surrogate;
        final_surrogate.push_back(0xdc00);

        // Old italic A = U+10300, will get converted to: F0 90 8C 80 'z'.
        string16 surrogate_pair;
        surrogate_pair.push_back(0xd800);
        surrogate_pair.push_back(0xdf00);
        surrogate_pair.push_back('z');

        // Will get converted to the invalid char + 's': EF BF BD 's'.
        string16 unterminated_surrogate;
        unterminated_surrogate.push_back(0xd800);
        unterminated_surrogate.push_back('s');

        std::ostringstream stream;
        stream << initial_surrogate << "," << final_surrogate << ","
               << surrogate_pair << "," << unterminated_surrogate;

        EXPECT_STREQ("\xef\xbf\xbd,\xef\xbf\xbd,\xf0\x90\x8c\x80z,\xef\xbf\xbds",
            stream.str().c_str());
    }
}

TEST(String16Test, Hash)
{
    string16 str1 = ASCIIToUTF16("hello");
    string16 str2 = ASCIIToUTF16("world");

    std::unordered_set<string16> set;

    set.insert(str1);
    EXPECT_EQ(1u, set.count(str1));
    EXPECT_EQ(0u, set.count(str2));
}

} // namespace base
